Ultra-high field (UHF ≥7T) MRI scanners can provide stronger signals than standard field strengths, which boosts signal-to-noise ratio (SNR) for improved diffusion MRI (dMRI). However, at 7T, wavelength effects cause highly inhomogeneous $$$B_1^+$$$ in the human brain, with lower transmit efficiency in the cerebellum and temporal lobes manifesting as signal dropouts in these regions. Recently, we reported a simple approach of using a wireless radiofrequency (RF) array to improve transmit efficiency and signal sensitivity at 7T focusing on the posterior fossa. Here we demonstrate the feasibility and effectiveness of using the RF array for in-vivo dMRI at 7T.
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